JP3208086B2 - Rectangular section tunnel excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rectangular section tunnel excavator for excavating a rectangular pipe embedding tunnel prior to embedding a small-diameter rectangular pipe in the ground.

[0002]

2. Description of the Related Art Conventionally, when constructing an underground structure crossing a track or a road underground, for example, a shaft is excavated across a track or a road, and a plurality of rectangular pipes are planned between the shafts. After the pipe roof is formed by burying the pipe roof at least at the upper floor position of the underground structure, and the front end face of the ready-made underground structure is brought into contact with the rear end face of the pipe roof from one of the shafts, 2. Description of the Related Art It has been practiced to excavate and excavate earth and sand inside an object to replace a pipe roof with an underground structure.

At this time, in order to bury each rectangular pipe for forming the above-mentioned pipe roof in the ground, FIG.
As shown in FIG. 5, a fixed-length rectangular pipe 31 having an auger screw 32 rotatably inserted therein is propelled from one shaft 33 by a jack 34 installed in the shaft 33, and an auger screw 32 is driven by a motor 35. Rotate 32 to bury while excavating the ground in front, bury one rectangular pipe 31 and then the next rectangular pipe 31 and auger screw 32
By repeating this operation, a plurality of rectangular pipes are buried in series between both shafts.

[0004]

However, according to the rectangular pipe propulsion and embedding means as described above, the ground in front of the rectangular pipe 31 is excavated by the auger screw 32 having a circular cross section disposed in the rectangular pipe 31. Therefore, not only the ground that cannot be excavated by the auger screw 32 remains at the four corners of the rectangular pipe 31 but the propulsion resistance of the rectangular pipe 31 increases, and the rotation of the auger screw 32 causes the rectangular pipe 31 to There is a problem that accurate embedding cannot be performed because there is a risk of rolling in the rotation direction and direction control is difficult. In particular, when the rectangular pipe 31 is displaced in the vertical direction, the entire pipe roof is deformed into a corrugated shape in the width direction, which hinders replacement with the underground structure. Also, as the buried length of the pipe increases, it becomes difficult to control the rotation of the auger screw 32 that is added, and there is a problem that long-distance construction cannot be performed.

Instead of excavating the ground with the auger screw, a circular cutter is rotatably disposed at the front end opening of the skin plate having a rectangular cross section, and an auxiliary for excavating the ground that cannot be excavated with the circular cutter. A rectangular section tunnel excavator in which a cutter is movably arranged along the front edge of the skin plate is known. However, in this excavator, the occurrence of rolling and the difficulty of directional control occur as described above. There is a problem that the operation mechanism of the auxiliary cutter is complicated and a failure easily occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a rectangular section in which rolling is unlikely to occur, direction can be controlled, and a rectangular section tunnel can be excavated smoothly and efficiently. To provide a tunnel excavator.

[0007]

In order to achieve the above object, a rectangular section tunnel excavator according to the present invention has a partition wall integrally stretched near a front end opening and excavates an inside of an opening end on a front side of the partition wall. A skin plate having a rectangular cross section formed in the sediment intake space, and a vertical direction between the upper half portion and the lower half portion of the skin plate in front of the open end of the skin plate over the entire width of the open end. Upper and lower sediment scraping members each having a cutting blade protruding from a front end disposed reciprocally rotatable, a jack for vertically rotating these upper and lower sediment scraping members, and a front end opening the part from the partition wall are composed of a sand discharge pipe to face the above excavating sand taking space
In the tunnel excavator with rectangular cross section,
The scraping member and the lower earth and sand scraping member are formed of a rectangular oblong scraping plate that is substantially equal to the opening width of the skin plate and that is inclined obliquely forward and downward from the opening end of the skin plate. A plurality of cutting blades are protrudingly provided on the front edge, and side walls which are bent at right angles toward the rear are integrally provided on both side ends of the scraping plate. A rod for the jack, wherein the lower end of the wall plate is rotatably pivotally attached to both upper side surfaces of the front end of the skin plate in the sediment intake space, and the rear end portion of both side wall plates is disposed at the upper end of the skin plate. In the lower sediment scraping member, the upper ends of the both side wall plates are pivotally connected to the lower front side surfaces of the skin plate in the sediment intake space and the rear ends of the both side wall plates. Skin on the part It has a structure that is connected to the rod end of the jack which is disposed in the lower portion of the rate.

[0008]

The upper half of the skin plate scraping member provided at the open end of the skin plate is moved forward and backward by the jack expansion and contraction while the skin plate, which is the body of the excavator, is propelled. When the lower sediment scraping member is vertically rotated between the lower halves of the skin plate by the expansion and contraction operation of the jack, the skin is cut by the front end cutting blade of the upper sediment scraping member. The front ground of the upper half of the plate is entirely excavated, and the front ground of the lower half of the skin plate is entirely excavated by the front end cutting blade of the lower sediment scraping member.

As described above, the front ground of the upper and lower halves of the skin plate is excavated by the upper and lower earth and sand scraping members together with the propulsion of the skin plate, which is the body of the excavator, thereby completely covering the front ground of the skin plate. To excavate. At this time, since the ground is excavated by the front end cutting blade by moving the upper and lower sediment scraping members up and down, the skin plate does not have a risk of rolling, and furthermore, the tunnel of the rectangular cross section is surely and efficiently formed. Can be drilled.

[0010] Further, by vertically rotating one of the upper and lower sediment scraping members,
Since it is possible to excavate the front ground of only the upper half or the lower half of the skin plate, and to rotate these upper and lower sediment scraping members vertically within a desired rotation angle range, When it is desired to correct the direction of the excavator upward, the excavator can be advanced upward by excavating the other portion while leaving the upper end ground in front of the rectangular opening end of the skin plate, and the downward direction can be achieved. If it is desired to make corrections, the excavator can be easily corrected in that direction by propelling the excavator while excavating the other portion while leaving the lower end ground in front of the rectangular opening end of the skin plate.

The earth and sand excavated by the upper and lower earth and sand scraping members are taken into the earth and sand intake space inside the opening end of the skin plate, and are stirred by the stirring blades together with the muddy water supplied to the space through the partition of the skin plate. The air is discharged backward by a discharge pipe facing the space through the lower end of the partition wall. In this way, when the tunnel excavator of the present invention excavates a tunnel having a rectangular cross section and burys a rectangular pipe, the same cross section as the skin plate is sequentially provided at the rear end of the skin plate every time a tunnel of a certain length is excavated. What is necessary is just to sequentially follow the steel fixed-length rectangular pipe which has a shape.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a simplified longitudinal side view of a tunnel excavator having a rectangular cross section, and FIG. A skin plate made of a rectangular steel pipe having a rectangular cross section with open front and rear ends. A four-sided peripheral edge of a partition wall 2 is integrally fixed to an inner peripheral surface near a front end opening of the skin plate 1. The inside of the skin plate 1 between the front surface of the skin plate 1 and the opening front end of the skin plate 1 is formed in the earth and sand intake space 3.

In front of the partition wall 2 extending at the opening end of the skin plate 1, the upper and lower portions of the sediment intake space 3 extend over the entire width of the opening end of the skin plate 1. An upper sediment scraping member 4 having a cutting blade 4a for excavating the front ground of a half portion, and a cutting blade 5a for excavating the front ground of the lower half of the skin plate 1 over the entire width of the open end of the skin plate 1. Are provided respectively.

The upper earth and sand scraping member 4 has a width substantially equal to the opening width of the skin plate 1.
The front side edge of a horizontally elongated rectangular scraping plate 4b which is inclined obliquely upward and forward from the upper portion of the opening end of the opening plate and whose front end projects forward from the opening end of the skin plate 1 The cutting blades 4a are protruded at small intervals, and side wall plates 4c are provided integrally on both ends of the raking plate 4b and are fixed at right angles to the raking plate 4b toward the rear. From the rear end of the scraping plate 4b, these both side wall plates 4c,
The lower end of 4c is projected downward to form a leg 4d, and both legs 4d, 4d are pivotally attached to the upper ends of both sides of the open end of the skin plate 1 by a pivot 6 so as to be rotatable vertically. I have.

Similarly, the lower sediment scraping member 5
Is approximately equal to the opening width of the skin plate 1 and is inclined obliquely downward from the lower part in the opening end of the skin plate 1 toward the front so that the front end projects forward from the opening end of the skin plate 1. A plurality of the cutting blades 5a are protruded at small intervals on the front edge of the front horizontally elongated rectangular scraping plate 5b, and the scraping plates 5b are provided on both side ends of the scraping plate 5b.
A side wall plate 5c fixed at a right angle toward the rear is integrally provided, and the upper ends of these side wall plates 5c, 5c are projected upward from the rear end of the scraping plate 5b to form leg portions. 5d, and both legs 5d, 5d are pivotally attached to the lower portions of both side plates at the open end of the skin plate 1 by a pivot 7 so as to be vertically rotatable.

Further, the upper and lower sediment scraping members 4, 5
The rear ends of the side walls 4c and 5c of the scraping plates 4b and 5b are rotatably connected to the rod ends of jacks 8 and 9 mounted on the upper and lower ends of the partition 2 by pins 10 and 11, respectively. are doing. Therefore, when the rod of the upper jack 8 is expanded and contracted, the upper sediment scraping member 4 rotates vertically about the pivot 6 so that the front end cutting blade 4a is moved forward of the skin plate 1 at the opening end of the skin plate 1. When the rod of the lower jack 9 is extended and retracted in a vertical arc within the range of the upper half from the upper end to the center of the lower part, the lower sediment scraping member 5 moves up and down around the pivot 7. And the front end cutting blade 5a is reciprocated vertically in an arc in the range of the lower half from the lower end to the center of the skin plate 1 in front of the open end of the skin plate 1. are doing.

Numeral 12 denotes a muddy water supply pipe piped into the skin plate 1 from the rear in the tunnel. The opening front end of the muddy water supply pipe penetrates the upper end of the partition wall 2 and faces the sediment intake space 3. . Numeral 13 denotes a sediment discharge pipe which, like the muddy water supply pipe 12, is piped into the skin plate 1 from the rear in the tunnel, and has an opening front end penetrating the lower end of the bulkhead 2 and inside the sediment intake space 3. It is facing. This sediment discharge pipe is a vacuum discharge pipe and has an air pinch valve 14 at its front end.
And an air suction pipe 16 having an on-off valve 15 near and behind the air pinch valve 14.

Reference numeral 17 denotes a sediment stirring blade which rotates in the central portion of the sediment intake space 3 and has a central shaft 18 rotatably supported by the central portion of the partition wall 2 and a drive mounted on the rear side of the partition wall 2. It is configured to be rotated by a motor 19.

As shown in FIG. 3, the rectangular section tunnel excavator constructed as described above has a fixed size of the same size and shape as the skin plate 1 from the starting shaft 20 to the rear end of the skin plate 1 as its main body. Is pushed forward into the ground by a propulsion jack 22 installed in the starting shaft 20 while successively adding the rectangular pipes 21. By rotating the upper and lower sediment scraping members 4, 5 in the vertical direction at the front end side of the opening of the skin plate 1, The tip cutting blades 4a and 5a excavate a tunnel having a rectangular cross section, and a subsequent rectangular pipe 21 is embedded in the tunnel in series.

The method of excavating a tunnel with a rectangular cross section by this tunnel excavator will be described in more detail. The jacks 8 and 9 mounted on the upper and lower portions of the partition 2 of the skin plate 1 are operated to extend and contract the respective rods so that the upper and lower rods are expanded and contracted. The earth and sand scraping members 4 and 5 are vertically reciprocated about the pivots 6 and 7. At this time, while driving the upper sediment scraping member 4 so that the cutting blade 4a protruding from the front end thereof reciprocates vertically between the upper halves of the skin plate 1 in front of the skin plate 1, The lower sediment scraping member 5 is driven such that the cutting blade 5a protruding from the front end thereof reciprocates vertically between the lower halves of the skin plate 1 in front of the skin plate 1, and The cutting ground 4a of the soil plate scraping member 4 excavates the upper half front ground of the skin plate 1 over the entire width, and the cutting blade 5a of the lower sand raking member 5 cuts the lower half front ground of the skin plate 1. Excavate over the entire width.

The ground in front of the skin plate 1 includes an upper sediment scraping member 4 on the upper half side of the skin plate 1.
Is rotated downward to move the front end cutting blade 4a in an arc shape downward toward the inside of the skin plate 1, and the earth and sand excavated by the cutting blade 4a is scraped by a plate.
4b, the lower part 5 of the skin plate 1 is swung upward by turning the lower sediment scraping member 5 upward to cut the front end cutting blade 5a. Is moved upward in an arc toward the inside of the skin plate 1, and the earth and sand excavated by the cutting blade 5 a is scraped into the earth and sand intake space 3 in the skin plate 1 by the scraping plate 5 b. Things.

Thus, while the skin plate 1, which is the body of the excavator, is propelled, the cutting blades 4a, 5a of the upper and lower earth and sand scraping members 4, 5 excavate a tunnel portion having a rectangular cross section equal to the opening shape of the skin plate 1. Each time a tunnel of a length is excavated, a rectangular pipe 21 is added to the starting shaft 20.

When it is desired to control the direction upward during excavation of the tunnel excavator, the lower sediment scraping member 5 extends between the lower halves in front of the lower half of the open end of the skin plate 1. While turning the upper sediment scraping member 4 up and down within a certain angle range so as to leave the ground at the upper end in front of the upper half of the open end of the skin plate 1. The remaining portion of the skin plate 1 is cut with a cutting blade 4 while leaving the upper end ground in front of the open end.
By propelling the excavator while drilling at a, 5b,
The skin plate can move forward and control the direction upward so that the lower half side of the skin plate with the lower propulsion resistance precedes it. The excavator can be propelled while excavating the other portion with the cutting blades 4a and 5b while leaving the lower end ground in the above, so that the direction can be controlled.

The cutting blades 4a of the upper and lower sediment scraping members 4, 5,
The excavated earth and sand excavated by 5a and raked into the earth and sand intake space 3 by the raking plates 4b and 5b
13 discharges to the starting shaft 20 side. That is, the muddy water is supplied into the sediment intake space 3 of the skin plate 1 from the starting shaft 20 side through the muddy water supply pipe 12 through the subsequent rectangular pipe 21 to excavate the sediment and the stirring blades in the sediment intake space 3. The mixture is mixed with the muddy water, and the mixed sediment is mixed with the muddy water. The air pinch valve 14 is opened, and a certain amount of the mixed sediment is taken into the discharge pipe 13 from the sediment intake space 3 by a vacuum suction force. By closing 14 and opening the on-off valve 15 of the air suction pipe 16 connected to the air pinch valve 14, the sediment taken in the discharge pipe 13 is discharged to the start shaft 20 side. In the above embodiment, the vacuum suction force is used as the discharging means, but a screw conveyor having a screw provided in the discharge pipe 13 may be used.

Further, as the upper and lower sediment scraping members 4 and 5, single horizontal rectangular scraping plates 4b and 5b each having the same opening width as the skin plate 1 are connected to the upper half of the skin plate 1 by jacks 8 and 9, respectively. The soil plate 1 is vertically moved in front of the lower half to excavate the ground having the same width as the skin plate 1 in the vertical direction. The left and right upper sediment is divided into left and right upper sediment scraping members and left and right lower sediment scraping members, and the upper half front ground of the skin plate 1 is independently moved up and down by respective jacks. While the excavation is performed by the scraping members, the lower ground front ground is configured to be excavated by the left and right lower sediment scraping members that individually move up and down by the respective jacks. May be. In this way, by arranging the earth and sand scraping members at the four positions on the upper, lower, left and right sides of the opening end of the skin plate 1, for example, when it is desired to correct the direction to the right, the skin is scraped by the upper and lower earth and sand scraping members on the left. If it is propelled while excavating the ground in front of the left half of the plate 1, the direction can be corrected in that direction.

[0026]

As described above, according to the rectangular section tunnel excavator of the present invention, the partition wall is integrally stretched in the vicinity of the front end opening, and the inside of the opening end on the front side of the partition wall is excavated in the sediment intake space. A skin plate having a rectangular cross section formed at the front end of the skin plate, and reciprocally vertically movable between an upper half portion and a lower half portion of the skin plate in front of an open end of the skin plate over the entire width of the open end. The upper and lower sediment scraping members formed by projecting a cutting blade at the front end disposed on the front end, jacks for rotating these upper and lower sediment scraping members in the vertical direction, and the front end opening from the partition wall. Since it consists of a sediment discharge pipe facing the excavated sediment intake space, the top and bottom sediment scraping members are rotated by rotating the upper and lower sediment scraping members while propelling the skin plate. Plate opening The cutting blade being projected over between can be drilled and reliably and efficiently a tunnel having a skin plate of the same rectangular cross-section, moreover,
Excavated soil is discharged backward through the discharge pipe while being taken into the intake space, so that long-distance tunnels can be excavated. In addition, the tunnel excavation is performed by vertically moving the sediment scraping member up and down Therefore, the skin plate does not have a possibility of rolling and can excavate a tunnel with high accuracy.

Further, the upper and lower earth and sand scraping members have cutting blades projecting from the open ends of the skin plate to the front end edges of a horizontally long rectangular scraping plate inclined obliquely forward in the vertical direction. When the upper sediment scraping member is pivoted downward, the cutting blade at the front end excavates the front half of the upper half of the skin plate, and the excavated sediment is taken in by the scraping plate. It can be actively scraped into the space, and excavated by the scraping plate while excavating the front ground of the lower half of the skin plate by the front cutting blade when the lower earth and sand scraping member rotates upward Sediment can be actively scraped into the sediment intake space.

Further, since the upper and lower sediment scraping members can be turned up and down within a desired angle range, the upper end of the skin plate in front of the rectangular opening end can be used to correct the direction of the excavator upward. The excavator can be advanced upward by excavating other parts while leaving the ground, and if you want to correct the direction downward, leave the lower end ground in front of the rectangular opening end of the skin plate and other parts If the excavator is propelled while excavating, the direction can be easily corrected.

A muddy water supply pipe which penetrates the upper end of the partition wall from the rear side of the skin plate and supplies muddy water to the excavated sediment intake space, and a front end opening is formed by the excavated sediment intake from the lower end of the partition wall. By providing a discharge pipe that faces the space and discharges the excavated earth and sand backward, and a stirring blade that is rotatably supported by the partition wall and stirs the earth and sand in the excavated earth and sand intake space , the skin is provided. While injecting muddy water into the excavated earth and sand taken into the front end of the opening of the plate, the stirring blades can be used to surely discharge the soil without large lumps and discharge it through the discharge pipe.

[Brief description of the drawings]

FIG. 1 is a simplified longitudinal side view of a rectangular section tunnel excavator,

FIG. 2 is a front view thereof,

FIG. 3 is a simplified longitudinal side view during tunnel excavation,

FIG. 4 is a simplified longitudinal sectional side view showing a conventional rectangular section tunnel excavator;

FIG. 5 is a front view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Skin plate 2 Partition wall 3 Sediment intake space part 4 Upper sediment scraping member 4a Cutting blade 5 Lower sediment scraping member 5a Cutting blade 8, 9 Jack 12 Muddy water supply pipe 13 Sediment discharge pipe 17 Stirrer blade

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E21D 9/08-9/10

Claims (1)

(57) [Claims] 1. A skin plate having a rectangular cross section in which a partition is integrally stretched in the vicinity of a front end opening and an inside of an opening end on the front side of the partition is formed in an excavated sediment intake space. An upper side formed by projecting a cutting blade at a front end which is reciprocally rotatable vertically between the upper half and the lower half of the skin plate over the entire width of the open end in front of the open end. And a lower and lower sediment scraping member, and a jack for vertically rotating these upper and lower sediment scraping members,
Tunnel excavation with a rectangular cross section consisting of a sediment discharge pipe with the front end opening facing the excavated sediment intake space from the bulkhead
The upper and lower sediment scraping members and the lower sediment
The scraping member is substantially equal to the opening width of the skin plate and
From the open end of the skin plate upward and downward respectively
横 掻 横 横 横 横 横
A plurality of cutting blades projecting from the front edge of the
Side walls bent at right angles backwards on both sides of the insert
Is provided integrally, and in the upper earth and sand scraping member
Between the lower ends of the side wall plates in the sediment intake space.
When pivotally mounted on both sides of the upper front end of the
At the rear end of the wall plate on both sides at the upper end of the skin plate
The jack end of the jack
For the buried member, take in the upper ends of
Pivot to the lower side of the front end of the skin plate in the space
Attach freely and skin play on the rear end of both side wall boards
Connect the rod end of the jack located at the lower end of the jack
Rectangular cross-section tunnel boring machine, characterized in that it is.